Dragonfly topology having duplicated links

Description

Dragonfly topology isn't building links properly, resulting in duplicated connections between switches. This could possibly be a consequence of the refactoring I performed regarding hierarchical topologies, to generalize methods and attributes for several topologies. Methods CDFly::BuildLocalInterconnection() and void CHierarchicalTopology::BuildInterconnection() will probably be the origin of the problem, and also the methods that are called inside them (CDFlyGroup::ConnectLocalPorts() and CDFlyGroup::ConnectGlobalPort).

Reproduce the issue

Checkout to commit a772e15c, run a Dragonfly unit test (for example, dfly_a2_h3_p3) and check the values of m_pChannelList. In this particular topology, for example, the link SW0[4] -- SW1[4] appears at least twice in the list, in positions 4 and 11.